When playing with the customize tools, I noticed that the reset button is not really noticeable after changing the properties of the icons.

Styling the reset button to red will signify danger and become noticeable.

Here's a screenshot of what I am talking about

CSS Code

.css-s700uk {
   --background-color: hsl(358, 91%, 45%); /* pick a suitable red color */
    box-shadow: inset 0 0 0 1px var(--background-color);
    background-color: var(--background-color);
}